-Cosmetic changes in the lobby code.
-Vastly improved chat system
	- Textarea message box
	- hitting enter sends the message and clears message area
	- hitting Shift+Enter adds a newline
	- chat area auto-scrolls with new messages when you're at the bottom of the list, and not otherwise
-Added escaping facilities to util.lisp for client-generated message purposes
-Included cl-ppcre
-zero-length messages are now dropped. I should probably add length constraints to the pseudo-type-system built up for the define-handler mini-language. Is just filtering empties good enough? I don't want to go the SO route where you're forced to say "Indubitably so, good sir" just because they don't consider "Ok." to be a good enough message. Is a two-character lower-limit acceptable?